Better task interval fetching

Fixes #5700

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

src/NzbDrone.Core/Jobs/TaskManager.cs

@@ -123,9 +123,19 @@ namespace NzbDrone.Core.Jobs
 
         private int GetBackupInterval()
         {
-            var interval = _configService.BackupInterval;
+            var intervalDays = _configService.BackupInterval;
 
-            return interval * 60 * 24;
+            if (intervalDays < 1)
+            {
+                intervalDays = 1;
+            }
+
+            if (intervalDays > 7)
+            {
+                intervalDays = 7;
+            }
+
+            return intervalDays * 60 * 24;
         }
 
         private int GetRssSyncInterval()
@@ -167,7 +177,7 @@ namespace NzbDrone.Core.Jobs
         public void HandleAsync(ConfigSavedEvent message)
         {
             var rss = _scheduledTaskRepository.GetDefinition(typeof(RssSyncCommand));
-            rss.Interval = _configService.RssSyncInterval;
+            rss.Interval = GetRssSyncInterval();
 
             var importList = _scheduledTaskRepository.GetDefinition(typeof(ImportListSyncCommand));
             importList.Interval = GetImportListSyncInterval();